Cambodia: Prek Toal (part of Tonle Sap Biosphere Reserve)
Prek Toal, located within Cambodia’s Tonle Sap floodplain, is a core zone of the Tonle Sap Biosphere Reserve and represents one of the most important freshwater wetland ecosystems in Southeast Asia. The site is characterized by extensive seasonally flooded forests, wetlands, and open water systems that support exceptional biodiversity. It is globally recognized for sustaining large breeding colonies of waterbirds, including several threatened species of international conservation importance. Driven by the Tonle Sap–Mekong flood pulse, seasonal hydrological dynamics underpin high biological productivity and maintain the ecological integrity of this unique wetland system.
 
The site is also critical for local livelihoods, supporting fishing-dependent communities that rely on its rich natural resources for food security and income. Prek Toal provides essential ecosystem services, including fisheries production, flood regulation, and habitat provision. However, increasing pressures from overfishing, habitat degradation, hydrological alterations, and climate change threaten its long-term sustainability. Strengthening site-based management, conserving flooded forests, and promoting sustainable, community-based livelihood options offer key opportunities to enhance resilience, improve incomes, and reinforce stewardship while safeguarding the ecosystem services of this globally significant wetland.
 

RFI Site Snapshot

City Municipality Province Region Aek Phnum and Sangkae Districts, Battambang Province (access from Siem Reap City, Siem Reap Province)
Area Size 21,348 ha
Geographical Coordinates 13.12º N, 103.65º E
Conservation Designation
Designated as a Ramsar site in 2015, with the same boundary as the Prek Toal Core Area of Tonle Sap Biosphere Reserve, and as an IBA in 2003
 
Prek Toal Ramsar Site and its surrounding areas were designated as the Tonle Sap Multiple Use Area in 1993
Key Habitats and Biomes
1) gallery forest located along waterways, and around
seasonal ponds and lakes; 2) dense swamp forests dominated by Barringtonia sp. and shrubs, which cover most of the site; and 3) dense mats of grassland and herbaceous vegetation
Key Ecosystem Services and Values
Provisioning: fisheries, freshwater
Regulating: flood control, erosion
Cultural: ecotourism, recreation, aesthetic experience
Global Climate Regulation: Estimated Carbon Storage and Sequestration 479,000 to 583,000 tonnes of carbon, and the annual carbon sequestration rate is estimated at 18,800 tonnes per year
EAAF Species
Globally significant congregations:
Spot-billed Pelican Pelecanus philippensis (NT)
Painted Stork Mycteria leucocephala (LC)
Greater Adjutant Leptoptilos dubius (NT)
Asian Openbill Anastomus oscitans (LC)
Masked Finfoot Heliopais personatus (CR)
 
Significant numbers:
Lesser Adjutant Leptoptilos javanicus (NT)
Milky Stork Mycteria cinerea (EN)
Little Cormorant Microcarbo niger (LC)
Indian Cormorant Phalacrocorax fuscicollis (LC)
Sarus Crane Antigone antigone (VU)
River Lapwing Vanellus duvaucelii (NT)
Black-tailed Godwit Limosa limosa (NT)
Bar-tailed Godwit Limosa lapponica (NT)
Red-necked Stint Calidris ruficollis (NT)
Asian Woolly-necked Stork Ciconia episcopus (NT)
Black-necked Stork Ephippiorhynchus asiaticus (NT)
Grey-headed Fish Eagle Icthyophaga ichthyaetus (NT)
Oriental Darter Anhinga melanogaster (LC)
 Notable Biodiversity
several near-threatened and threatened terrestrial bird species:
Alexandrine Parakeet Psittacula eupatria (NT)
Red-breasted Parakeet Psittacula alexandri (NT)
Manchurian Reed Warbler Acrocephalus tangorum (VU)
Yellow-breasted Bunting Emberiza aureola (CR)
 
globally threatened mammal, reptile, and fish species:
Hairy-nosed Otter Lutra sumatrana (EN)
Fishing cat Prionailurus viverrinus (VU)
Long-tailed Macaque Macaca fascicularis (EN)
Indochinese Silvered Langur Trachypithecus germaini (EN)
Siamese Crocodile Crocodylus siamensis (CR)
Burmese Python Python bivittatus (VU)
Tonle Sap Water snake Enhydris longicauda (VU)
Northern River Terrapin Batagur baska (CR)
Asiatic Softshell Turtle Amyda cartilaginea (VU)
Yellow-headed Temple Turtle Heosemys annandalii (CR)
Mekong Giant Catfish Pangasianodon gigas (CR)
Giant Carp Catlocarpio siamensis (CR)
Flying Minnow Laubuka caeruleostigmata (EN)
Jullien's Golden Carp Probarbus jullieni (CR)
Mekong herring Tenualosa thibaudeaui (VU)
Bala Shark Balantiocheilos melanopterus (VU)
Scleropages formosus (EN)
Site Management Ministry of Environment, Provincial Department of Environment, Battambang and Siem Reap, Ministry of Agriculture, Forestry and Fisheries, MOWRAM
Key Drivers of Change long-term hydrological changes, land-use change,  unsustainable fishing practices, poaching, dry-season fires, invasive species, water pollution, destruction of cultural heritage buildings, droughts, erosion, and siltation/deposition
Opportunities for RFI Interventions Strengthen site management and enforcement, scaling up habitat restoration work, enhancing sustainable management of fisheries, and sustaining livelihoods through ecotourism
Investment Range Over Time Period $16,850,000 from at least 5 years up to 8 years

Disclaimer

The views expressed on this website are those of the authors and do not necessarily reflect the views and policies of the Asian Development Bank (ADB) or its Board of Governors or the governments they represent. ADB does not guarantee the accuracy of the data included in this publication and accepts no responsibility for any consequence of their use. By making any designation of or reference to a particular territory or geographic area, or by using the term “country” in this document, ADB does not intend to make any judgments as to the legal or other status of any territory or area.

Download

Topics

  • Agriculture and Natural Resources
  • Climate Change
  • Environment
  • Regional Cooperation and Integration